Datasheet

LT6100
1
6100fc
Typical applicaTion
FeaTures DescripTion
Precision, Gain Selectable
High Side Current Sense
Amplifier
The LT
®
6100 is a complete micropower, precision, high
side current sense amplifier. The LT6100 monitors unidi-
rectional currents via the voltage across an external sense
resistor. Fixed gains of 10, 12.5, 20, 25, 40, 50V/V are
obtained by simply strapping or floating two gain select
pins. Gain accuracy is better than 0.5% for all gains.
The LT6100 sense inputs have a voltage range that extends
from 4.1V to 48V, and can withstand a differential voltage
of the full supply. This makes it possible to monitor the
voltage across a MOSFET switch or a fuse. The part can
also withstand a reverse battery condition on the inputs.
Input offset is a low 300µV. CMRR and PSRR are in ex-
cess of 105dB, resulting in a wide dynamic range. A filter
pin is provided to easily implement signal filtering with a
single capacitor.
The LT6100 has a separate supply input, which operates
from 2.7V to 36V and draws only 60µA. When V
CC
is
powered down, the sense pins are biased off. This pre-
vents loading of the monitored circuit, irrespective of the
sense voltage. The LT6100 is available in an 8-lead DFN
and MSOP
package.
0A to 33A High Side Current Monitor with 12kHz Frequency Rolloff
applicaTions
n
Input Offset Voltage: 300µV (Max)
n
Sense Inputs Up to 48V
n
0.5% Gain Accuracy
n
Pin Selectable Gain: 10, 12.5, 20, 25, 40, 50V/V
n
Separate Power Supply: 2.7V to 36V
n
Operating Current: 60µA
n
Sense Input Current (V
CC
Powered Down): 1nA
n
Reverse Battery Protected to –48V
n
Buffered Output
n
Noise Filtering Input
n
–40°C to 125°C Operating Temperature Range
n
Available in 8-Lead DFN and MSOP Packages
n
Battery Monitoring
n
Fuse Monitoring
n
Portable and Cellular Phones
n
Portable Test/Measurement Systems
V
EE
V
OUT
4
FIL
A4V
CC
V
S
+
R
SENSE
3mΩ
8
V
S
1
3V
CONFIGURED FOR GAIN = 25V/V
4.4V TO 48V
SUPPLY
A2
72 6
LT6100
3
5
6100 TA01a
V
OUT
= 2.5V
I
SENSE
= 33A
220pF
LOAD
V
S
SENSE INPUT VOLTAGE (V)
–1.5
INPUT OFFSET VOLTAGE (mV)
–0.5
0.5
1.5
–1.0
0
1.0
10 20 30 40
6100 TA01b
5050 15 25 35 45
V
SENSE
= 100mV
V
CC
= 3V
T
A
= 25°C
Input Offset Voltage
vs V
S
Sense Input Voltage
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respective owners.

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